Internal Part Broken on 28" Long Balance

Hi there, Kevin.

Thank you for reaching out to us. Based on your photos, it appears you have either the Series 351 or Series 390 channel balances. The difference between these two similar-looking balances is the depth of the bottom fitting. The photo below will show you what I mean. 

Comparison of the S351 and S390 balance shoes.

The "33" at the end of the balance stamp may represent the sash weight so if that's the case I recommend the 2765 option. A pair of balances with this stamp will support a sash weighing 33 to 36 pounds. You can always weigh the window sash on a scale to confirm. 

Let me know if you have any questions! 

My pleasure! Best of luck with the repair and please let me know if I can be of further help.